| Abstract |
The objective of this study was to compare capacity of antioxidant enzymes between Khon Kaen 3 (KK3), a drought-tolerant, and Suphanburi 72 (SP72), a drought-sensitive sugarcane variety. Young sugarcane plants were grown under controlled conditions. Water stress was imposed at 4 leaf stage by withholding water supply for 4, 6 and 8 days as compared to control, receiving adequate water supply. First fully expanded leaves were harvested and proteins were extracted for assaying the activities of ascorbate peroxidase (APX), peroxidase (POX) and catalase (CAT). APX was a major antioxidant system in leaves of both the sugarcane varieties as it accounted for by 65% in KK3 and 69% in SP72 in scavenging H2O2. POX accounted for 27% and 23% in KK3 and SP72, respectively in the removal of H2O2. Negligible scavenging activities of CAT were observed in both sugarcane varieties. APX activities in KK3 leaves were induced and maintained during progressive water stress and were 15% higher than that in SP72. POX activities in KK3 were 30% greater than that in SP72. In conclusion, drought tolerance in KK3 was, at least partially, due to the greater activities of APX and POX under water deficit stress as compared to those of SP72. |
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Journal Publication
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